EML viewer

An EML file is a single email saved to disk in the format mail actually travels in, defined by RFC 5322. It holds everything: the headers, the plain-text and HTML versions of the message, any embedded images, and every attachment, all encoded into one text file. Most mail clients produce one when you drag a message out to your desktop or choose "Save as".

Drop it into the viewer above and it opens immediately - no software, no account. On the desktop, most mail clients will also open one: Thunderbird and Apple Mail handle .eml natively, and on Windows, Outlook opens them if it is set as the default mail app. The awkward case is having no mail client installed at all, which is exactly what a browser-based viewer is for.

The file never leaves your device - it is read and parsed by JavaScript in your browser, not uploaded to a server. The message itself is displayed inside a sandboxed frame with scripts disabled and the HTML stripped of anything active, so a message carrying malicious markup cannot do anything as you read it. Attachments are only ever written to disk if you click download, and are not opened or executed by the viewer.

Yes. The viewer works in any modern mobile browser - tap the box to pick the file from your downloads or files app. This is often the easiest route on mobile, since phone mail apps are usually worse than desktop ones at opening a .eml attachment.

Open the file here, then use Save as PDF. That hands the rendered message to your browser's print dialog, where you choose "Save as PDF" as the destination. You get the message with its formatting intact and none of the surrounding page. It works the same way on Windows, macOS, Linux, Android and iOS.

Both. Attachments are listed with their real filenames, types and sizes, and download with one click. Embedded images - the ones referenced internally by a content ID rather than a web address - are extracted and displayed inline, so the message looks the way it was sent. A lot of free viewers show those as broken image icons.

EML is the open, standard format that mail itself uses, and is readable by essentially every mail client. MSG is a proprietary Microsoft format that Outlook uses when saving a message, and it is a binary file rather than text. This viewer reads .eml files. If you have a .msg, Outlook can re-save it as .eml, or you can forward the message to yourself and save the result.

Because that is what it is - the format is readable text with the message encoded inside it. Opening one in a text editor shows the headers, then base64 or quoted-printable blocks that are the actual content. That is not corruption; it just needs something that understands the encoding, which is what this page does.

Partly, here - and fully with the header analyzer. This viewer shows you the raw headers, which is where the evidence lives. To get SPF, DKIM and DMARC results interpreted, the delivery path reconstructed and spoofing signals flagged, paste those headers into our email header analyzer, which is free and also runs entirely in your browser.

The viewer handles files up to 25 MB, which covers essentially every email - the file has to hold its attachments inline, and most mail servers reject messages well below that. Larger files are refused rather than freezing your browser tab.